fix(lint): resolve audit findings on vale skills

Merge duplicate gotcha in vale-config (Packages vs BasedOnStyles was
stated twice) and align vale-run's category field with vale-config's
(lint, not linting) so sibling skills in the plugin agree.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FxG5T8EJDgkABXxuneuFfn

plugins/lint/skills/vale-run/SKILL.md

@@ -12,7 +12,7 @@ description: >
   vale-config skill.
 metadata:
   version: "0.1.0"
-  category: linting
+  category: lint
   source_keys:
     - context7-websites-vale-sh
 ---